Fig. 1.

Stimuli and results for experiment 1. (A) Each training trial began with binocular-fusion-assisting frames. By decreasing the contrast of the frame of the DE (the left eye, LE) until both frames (Left and Middle) were visible and adjusting the vertical and horizontal positions of the two frames separately, strabismic/amblyopic observers were able to achieve binocular fusion and alignment (Right). RE, right eye. (B) Once fusion was achieved, vertically aligned target (Upper) and reference (Lower) gratings were presented to the two eyes stereoscopically until a response was given. Each stimulus patch had square envelopes in both the horizontal and vertical directions. (C) Results: percentage of correct responses vs. the number of training trials. The horizontal dashed line indicates the chance level (50%). Each point represents the performance based on 180 trials, updated in increments of 36 trials.